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Old 09/11/2019, 01:37 AM   #1
jjencek
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Join Date: Dec 2016
Location: Prague, Czech Republic
Posts: 261
Hanna Phosphorus Test Turning Navy Blue - help

I have been using the Hanna Checker Phosphotus ULR for some time now.

My results are pretty consistent between 0 to 5 ppb (0.01533 ppm phosphate).

About two weeks ago it was close to zero.

When I measured it today, the solution turned navy blue as soon as I added the reagent to it. Of course the tester went over the scale.

I have never seen it before - anybody has an explanation?


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